I would look at Arlons 25N. http://www.arlon-med.com/micro.html Jeffrey Bush Director, Quality Assurance and Technical Support 76 Technology Drive - POB 1890 Brattleboro, Vermont 05302-1890 Tel. 802.257.4571.21 Fax. 802.257.0011 [log in to unmask] http://www.vtcircuits.com -----Original Message----- From: Colin Weber [mailto:[log in to unmask]] Sent: Friday, August 20, 2004 12:37 AM To: [log in to unmask] Subject: [TN] Search for HF Laminate Material Hi Folks, Does anybody know of a material which can meet or exceed the following specifications for a Rogers RO4003C, which has UL approval (94V-0)? Dielectric Constant 3.38 +-0.05 Dissipation Factor tan 0.0027/0.0021 Temperature Coefficient +40 ppm/deg. C Coefficient of Thermal Expansion x=11, Y=14, Z=46 ppm/deg. C water absorption 0.04% FR4 standard Processing The application is for making capacitors out of PCB material. The Rogers RO4350B UL material did not perform as well as the RO4003C. Regards, Colin Weber --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------